That looks like it. Strangely the text is fine when doing it with the jolla-settings app. Edit : not exactly, there is 90% of the text ok, but a thing like ""settings-me-add_to_favorites" is not shown correctly, so same problem here.
Hmmmm.... It doesn't work for me. I used your .json file, created the necessary folders, even rebooted but still no cigar... Do I have to change something in the launcher, too?